1621130265 has 12 divisors (see below), whose sum is σ = 2809959204. Its totient is φ = 864602784.

The previous prime is 1621130243. The next prime is 1621130279. The reversal of 1621130265 is 5620311261.

1621130265 is a `hidden beast` number, since 1 + 621 + 1 + 30 + 2 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1176215616 + 444914649 = 34296^2 + 21093^2 .

It is not a de Polignac number, because 1621130265 - 2¹⁴ = 1621113881 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18012514 + ... + 18012603.

It is an arithmetic number, because the mean of its divisors is an integer number (234163267).

Almost surely, 2^1621130265 is an apocalyptic number.

1621130265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1621130265 is a deficient number, since it is larger than the sum of its proper divisors (1188828939).

1621130265 is a wasteful number, since it uses less digits than its factorization.

1621130265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36025128 (or 36025125 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1621130265 is about 40263.2619766457. The cubic root of 1621130265 is about 1174.7333669933.

The spelling of 1621130265 in words is "one billion, six hundred twenty-one million, one hundred thirty thousand, two hundred sixty-five".